Almost all intake pipes are made of mandrel bent aluminum including Dinan and JC intakes. Aluminium dissipates heat very quickly which is why it used. Yes, they are all powder coated to increase durability, looks, and keep it cooler, but none the less it is still made from aluminum. The only place the heat shield would theoretically touch the pipe is where it enters the hole, but the surface area to contact ratio would be so small and insignifant that heat conduction would not be an issue with any type of metal.
The purpose of the heat shield is to block engine heat, coming off the radiator, block, etc, from being sucked in by the intake. By creating this "chamber" hot air is not able to enter the intake tube and the cooler air from lower in the bumper (Dinan style) or outside (short RAM) will be allowed to enter the intake.
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